SPECTROMETRICAL DISCUSSION ON ACCELERATIVE MECHANISM OF METHANOL IN CR-CHROME AZUROL S REACTION

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Abstract
An addition of methanol into the aqueous solution of chrome azurol S (CAS) accelerates the reaction of CAS with Cr. The mechanism of the accelerative effect of methanol was described spectrometrically. CAS has 4 chemical species, and the 3rd chemical species (in which 3 protons are released) is most liable to chelate Cr. In a high pH range, the 3rd chemical species increases in the solution, but at the same time an increase in hydroxy ion interrupts the reaction between CAS and Cr. Spectrometrical measurements indicate that the added methanol accelerates the dissociation of the 2nd chemical species of CAS in a low pH range and the reduction of the 4th chemical species in a high pH range. The 3rd chemcical species is highly concentrated in the solution, leading to an acceleration of the Cr-CAS reaction without any interruption caused on an increase of OH-.

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